var ie_png = {
ns: 'ie_png',
imgSize: {},
createVmlNameSpace: function() { /* enable VML */
if (document.namespaces && !document.namespaces[this.ns]) { document.namespaces.add(this.ns, 'urn:schemas-microsoft-com:vml'); }
if (window.attachEvent) { window.attachEvent('onbeforeunload', function() { ie_png = null; }); }},
createVmlStyleSheet: function() { /* style VML, enable behaviors */
/*  Just in case lots of other developers have added
lots of other stylesheets using document.createStyleSheet
and hit the 31-limit mark, let's not use that method!
further reading: http://msdn.microsoft.com/en-us/library/ms531194(VS.85).aspx */
var style = document.createElement('style'); document.documentElement.firstChild.insertBefore(style, document.documentElement.firstChild.firstChild);
var styleSheet = style.styleSheet;
styleSheet.addRule(this.ns + '\\:*', '{behavior:url(#default#VML)}');
styleSheet.addRule(this.ns + '\\:shape', 'position:absolute;');
styleSheet.addRule('img.' + this.ns + '_sizeFinder', 'behavior:none; border:none; position:absolute; z-index:-1; top:-10000px; visibility:hidden;'); /* large negative top value for avoiding vertical scrollbars for large images, suggested by James O'Brien, http://www.thanatopsic.org/hendrik/ */
this.styleSheet = styleSheet;
},
readPropertyChange: function() {
var el = event.srcElement;
if (event.propertyName.search('background') != -1 || event.propertyName.search('border') != -1) { ie_png.applyVML(el); }
if (event.propertyName == 'style.display') { var display = (el.currentStyle.display == 'none') ? 'none' : 'block'; for (var v in el.vml) { el.vml[v].shape.style.display = display; } }
if (event.propertyName.search('filter') != -1) { ie_png.vmlOpacity(el); }
},
vmlOpacity: function(el) { if (el.currentStyle.filter.search('lpha') != -1) { var trans = el.currentStyle.filter; trans = parseInt(trans.substring(trans.lastIndexOf('=')+1, trans.lastIndexOf(')')), 10)/100; el.vml.color.shape.style.filter = el.currentStyle.filter; /* complete guesswork */ el.vml.image.fill.opacity = trans; /* complete guesswork */ } },
handlePseudoHover: function(el) { setTimeout(function() { /* wouldn't work as intended without setTimeout */ ie_png.applyVML(el); }, 1);
},
/**
* This is the method to use in a document. @param {String} selector - REQUIRED - a CSS selector, such as '#doc .container'
**/
fix: function(selector) { var selectors = selector.split(','); /* multiple selectors supported, no need for multiple calls to this anymore */ for (var i=0; i<selectors.length; i++) { this.styleSheet.addRule(selectors[i], 'behavior:expression(ie_png.fixPng(this))'); /* seems to execute the function without adding it to the stylesheet - interesting... */ }
},
applyVML: function(el) { el.runtimeStyle.cssText = ''; this.vmlFill(el); this.vmlOffsets(el); this.vmlOpacity(el); if (el.isImg) { this.copyImageBorders(el); } },
attachHandlers: function(el) {
var self = this;
var handlers = {resize: 'vmlOffsets', move: 'vmlOffsets'};
if (el.nodeName == 'A') { var moreForAs = {mouseleave: 'handlePseudoHover', mouseenter: 'handlePseudoHover', focus: 'handlePseudoHover', blur: 'handlePseudoHover'}; for (var a in moreForAs) { handlers[a] = moreForAs[a]; } }
for (var h in handlers) { el.attachEvent('on' + h, function() { self[handlers[h]](el); }); }
el.attachEvent('onpropertychange', this.readPropertyChange);
},
giveLayout: function(el) { el.style.zoom = 1; if (el.currentStyle.position == 'static') { el.style.position = 'relative'; }
},
copyImageBorders: function(el) { var styles = {'borderStyle':true, 'borderWidth':true, 'borderColor':true}; for (var s in styles) { el.vml.color.shape.style[s] = el.currentStyle[s]; } },
vmlFill: function(el) { if (!el.currentStyle) { return; } else { var elStyle = el.currentStyle; }
for (var v in el.vml) { el.vml[v].shape.style.zIndex = elStyle.zIndex; }
el.runtimeStyle.backgroundColor = '';
el.runtimeStyle.backgroundImage = '';
var noColor = (elStyle.backgroundColor == 'transparent');
var noImg = true;
if (elStyle.backgroundImage != 'none' || el.isImg) {
if (!el.isImg) { el.vmlBg = elStyle.backgroundImage; el.vmlBg = el.vmlBg.substr(5, el.vmlBg.lastIndexOf('")')-5); } else { el.vmlBg = el.src; }
var lib = this;
if (!lib.imgSize[el.vmlBg]) { /* determine size of loaded image */
var img = document.createElement('img');
lib.imgSize[el.vmlBg] = img;
img.className = lib.ns + '_sizeFinder';
img.runtimeStyle.cssText = 'behavior:none; position:absolute; left:-10000px; top:-10000px; border:none;'; /* make sure to set behavior to none to prevent accidental matching of the helper elements! */
img.attachEvent('onload', function() { this.width = this.offsetWidth; /* weird cache-busting requirement! */ this.height = this.offsetHeight; lib.vmlOffsets(el); }); img.src = el.vmlBg; img.removeAttribute('width'); img.removeAttribute('height'); document.body.insertBefore(img, document.body.firstChild); }
el.vml.image.fill.src = el.vmlBg; noImg = false; } el.vml.image.fill.on = !noImg; el.vml.image.fill.color = 'none'; el.vml.color.shape.style.backgroundColor = elStyle.backgroundColor; el.runtimeStyle.backgroundImage = 'none'; el.runtimeStyle.backgroundColor = 'transparent'; },
/* IE can't figure out what do when the offsetLeft and the clientLeft add up to 1, and the VML ends up getting fuzzy... so we have to push/enlarge things by 1 pixel and then clip off the excess */
vmlOffsets: function(el) { var thisStyle = el.currentStyle; var size = {'W':el.clientWidth+1, 'H':el.clientHeight+1, 'w':this.imgSize[el.vmlBg].width, 'h':this.imgSize[el.vmlBg].height, 'L':el.offsetLeft, 'T':el.offsetTop, 'bLW':el.clientLeft, 'bTW':el.clientTop}; var fudge = (size.L + size.bLW == 1) ? 1 : 0;
/* vml shape, left, top, width, height, origin */
var makeVisible = function(vml, l, t, w, h, o) { vml.coordsize = w+','+h; vml.coordorigin = o+','+o; vml.path = 'm0,0l'+w+',0l'+w+','+h+'l0,'+h+' xe'; vml.style.width = w + 'px'; vml.style.height = h + 'px'; vml.style.left = l + 'px'; vml.style.top = t + 'px'; }; makeVisible(el.vml.color.shape, (size.L + (el.isImg ? 0 : size.bLW)), (size.T + (el.isImg ? 0 : size.bTW)), (size.W-1), (size.H-1), 0);  makeVisible(el.vml.image.shape, (size.L + size.bLW), (size.T + size.bTW), (size.W), (size.H), 1); var bg = {'X':0, 'Y':0}; var figurePercentage = function(axis, position) { var fraction = true; switch(position) { 
case 'left':
case 'top':
bg[axis] = 0;
break;
case 'center':
bg[axis] = .5;
break;
case 'right':
case 'bottom':
bg[axis] = 1;
break;
default:
if (position.search('%') != -1) { bg[axis] = parseInt(position)*.01; } else { fraction = false; } }
var horz = (axis == 'X'); bg[axis] = Math.ceil(fraction ? ( (size[horz?'W': 'H'] * bg[axis]) - (size[horz?'w': 'h'] * bg[axis]) ) : parseInt(position));
if (bg[axis] == 0) { bg[axis]++; } };
for (var b in bg) { figurePercentage(b, thisStyle['backgroundPosition'+b]); }
el.vml.image.fill.position = (bg.X/size.W) + ',' + (bg.Y/size.H);
var bgR = thisStyle.backgroundRepeat;
var dC = {'T':1, 'R':size.W+fudge, 'B':size.H, 'L':1+fudge}; /* these are defaults for repeat of any kind */
var altC = { 'X': {'b1': 'L', 'b2': 'R', 'd': 'W'}, 'Y': {'b1': 'T', 'b2': 'B', 'd': 'H'} };
if (bgR != 'repeat') {
var c = {'T':(bg.Y), 'R':(bg.X+size.w), 'B':(bg.Y+size.h), 'L':(bg.X)}; /* these are defaults for no-repeat - clips down to the image location */
if (bgR.search('repeat-') != -1) { /* now let's revert to dC for repeat-x or repeat-y */ var v = bgR.split('repeat-')[1].toUpperCase(); c[altC[v].b1] = 1; c[altC[v].b2] = size[altC[v].d]; }
if (c.B > size.H) { c.B = size.H; } el.vml.image.shape.style.clip = 'rect('+c.T+'px '+(c.R+fudge)+'px '+c.B+'px '+(c.L+fudge)+'px)'; } else { el.vml.image.shape.style.clip = 'rect('+dC.T+'px '+dC.R+'px '+dC.B+'px '+dC.L+'px)'; } },
fixPng: function(el) { el.style.behavior = 'none'; 
if (el.nodeName == 'BODY' || el.nodeName == 'TD' || el.nodeName == 'TR') { /* elements not supported yet */ return; } el.isImg = false;
if (el.nodeName == 'IMG') { if(el.src.toLowerCase().search(/\.png$/) != -1) { el.isImg = true; el.style.visibility = 'hidden'; } else { return; } } else if (el.currentStyle.backgroundImage.toLowerCase().search('.png') == -1) { return; }
var lib = ie_png; el.vml = {color: {}, image: {}};
var els = {shape: {}, fill: {}};
for (var r in el.vml) { for (var e in els) { var nodeStr = lib.ns + ':' + e; el.vml[r][e] = document.createElement(nodeStr); } el.vml[r].shape.stroked = false; el.vml[r].shape.appendChild(el.vml[r].fill); el.parentNode.insertBefore(el.vml[r].shape, el); }
el.vml.image.shape.fillcolor = 'none'; /* Don't show blank white shapeangle when waiting for image to load. */
el.vml.image.fill.type = 'tile'; /* Ze magic!! Makes image show up. */
el.vml.color.fill.on = false; /* Actually going to apply vml element's style.backgroundColor, so hide the whiteness. */
lib.attachHandlers(el);
lib.giveLayout(el);
lib.giveLayout(el.offsetParent);
/* set up element */
lib.applyVML(el); } };
try {document.execCommand("BackgroundImageCache", false, true); /* TredoSoft Multiple IE doesn't like this, so try{} it */} catch(r) {}
ie_png.createVmlNameSpace(); ie_png.createVmlStyleSheet();